adam@cs.UAlberta.CA (Michel Adam; Gov't of NWT) (02/22/90)
On page 1 of INTRO(4) in the UNIX 3.51 Utilities User's Manual vol. II it is stated that a file on the UNIXpc cannot be larger than 1 megabyte in size. Yet I have used 'cat' to create a file much bigger than that. What am I missing ? Also, there was mention on the net of a 'VIDPAL' hardware fix necessary to make use of 'MGR'. What is this VIDPAL fix? Do I need it? Where can I get a copy of KSH (8/30/86 ?), the one that is not broken? Finally, I noticed that usage of the Floppydisc system in 'UA' slows down a communication (async_main) considerably. Is this something that can be fine tuned? Is there combination of actions to avoid on this machine ? Any and all help appreciated. Michel Adam Yellowknife, N.W.T. alberta!iceman!michel or alberta!adam
jcm@mtune.ATT.COM (John McMillan) (02/23/90)
In article <1990Feb22.085859.21111@cs.UAlberta.CA> adam@pembina.UUCP (Michel Adam) writes: > >On page 1 of INTRO(4) in the UNIX 3.51 Utilities User's Manual >vol. II it is stated that a file on the UNIXpc cannot be larger >than 1 megabyte in size. : This restriction was aborted: don't know if ANY release went out with it. ULIMIT restrictions are common, but most of us argued that it made little sense on a [typically] single-user system. : >Finally, I noticed that usage of the Floppydisc system in 'UA' >slows down a communication (async_main) considerably. Is this >something that can be fine tuned? Is there combination of >actions to avoid on this machine ? : The Floppy disk shares the DMA circuits with the Hard Disk. Therefore it will considerably slow down any HD accesses. If you have little RAM, this will slow your paging-in/-out. There may be considerable paging during async_main's start-up, even if you have lots of RAM. [_I_ don't use a_m.] I wouldn't expect much [any?] CPU burden from the Floppy activities that wasn't obvious [eg: compress ... > /dev/rfp021.] john mcmillan -- att!mtune!jcm -- muttering for self, not THEM